/* Copyright (c) 2020 XEPIC Corporation Limited */
/*
 * Copyright (c) 2000-2010 Stephen Williams (steve@icarus.com)
 * Copyright (c) 2001 Stephan Boettcher <stephan@nevis.columbia.edu>
 *
 *    This source code is free software; you can redistribute it
 *    and/or modify it in source code form under the terms of the GNU
 *    General Public License as published by the Free Software
 *    Foundation; either version 2 of the License, or (at your option)
 *    any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 * USA.
 */

#include "compiler.h"
#include "config.h"
#include "netlist.h"

NetUDP::NetUDP(NetScope *s, perm_string n, unsigned pins, PUdp *u)
    : NetNode(s, n, pins), udp(u) {
  pin(0).set_dir(Link::OUTPUT);
  for (unsigned idx = 1; idx < pins; idx += 1) {
    pin(idx).set_dir(Link::INPUT);
  }
  table_idx = udp->tinput.count() - 1;
}

bool NetUDP::first(string &inp, char &out) const {
  table_idx = (unsigned)-1;
  return next(inp, out);
}

bool NetUDP::next(string &inp, char &out) const {
  table_idx++;

  if (table_idx >= udp->tinput.count()) return false;

  if (is_sequential()) {
    inp = string("") + udp->tcurrent[table_idx] + udp->tinput[table_idx];
    assert(inp.length() == pin_count());
  } else {
    inp = udp->tinput[table_idx];
    assert(inp.length() == (pin_count() - 1));
  }

  out = udp->toutput[table_idx];
  assert((out == '0') || (out == '1') || (out == 'x') ||
         (is_sequential() && (out == '-')));

  return true;
}

char NetUDP::get_initial() const {
  assert(is_sequential());

  switch (udp->initial) {
    case verinum::V0:
      return '0';
    case verinum::V1:
      return '1';
    case verinum::Vx:
    case verinum::Vz:
      return 'x';
  }

  assert(0);
  return 'x';
}

unsigned NetUDP::port_count() const { return udp->ports.count(); }

string NetUDP::port_name(unsigned idx) const {
  assert(idx < udp->ports.count());
  return udp->ports[idx];
}
